Test-retest reliability and validity information for a high school drug use questionnaire.

This study reports test--retest reliability and validity information for an anonymous high school drug use questionnaire. All drug use items were highly reliable in testings on the same students eight weeks apart. Composite drug scores were also highly reliable. A nine-item lie scale gave virtually identical results on the two testings. The majority of students regardless of the frequency of their drug use stated that they would honestly report their cannabis and opium/heroin use. There was little evidence of defensiveness judging by the lie scores.